This shouldn't be there
process guard from the old experiments repo
pep8
cleanup
Refactor process_guard:
         * Allow selective enabling/disabling of features
         * Allow passing commands as arguments instead of just a list of commands in a file.
         * Make most of the settings optional
         * Detect processes death quicker than before.
         * Do not leave zombie processes around until the end of the execution.
         * Improve sub-process killing routine.